and around irregular cliffs, simply to find in a crack some ground for anchorage (Fig. 3).
From a technical standpoint also the cell structure of trees and other plants must be considered as a wonderful manifestation of the resources of nature.
In this respect, the stalk of a rye-plant may be mentioned as a typical example. This plant meets the same requirements that are
- Schwender, "Mechanische Probleme der Botanik," Leipzig, 1909.